Physics
Grade-10
Easy
Question
Commercial electric motors do not use:
- An electromagnet to rotate the armature
- The effectively large number of turns of conducting wire in the current-carrying coil
- A permanent magnet to rotate the armature
- A soft iron core on which the coil is wound
Hint:
permanent magnet do not produce strong magnetic field
The correct answer is: A permanent magnet to rotate the armature
- Since permanent magnet do not produce strong magnetic field it is not used in commercial electric motors.
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